Mulligan18
Cadet
- Joined
- Jun 1, 2016
- Messages
- 23
Friends, I am new to this forum and new to forums in general. I have read much about my problems in this and other forums and believe I have made good progress but I need help bringing these problems to conclusion. My boat is an 1994 StarCraft 1810ss with the 4.3LX Mercruiser 4bbl weber carb. I purchase it and used it a little last fall. It is in the water at a dock now.
Allow me to start with the fuel pump. My pump does not run when the key in in the on (not start) position. I hear conflicting advice on this. Should the fuel pump operate with the key in the on position without cranking or running the motor? There is no power to the pump at all when the engine is not running. The pump will run if I jump the connections at the solenoid (with the engine off).
Last year and again this year, I have sputtering and backfiring through the carb. I have replaced the plugs, battery, installed a rebuilt carb (old one was black as coal) and installed a new check valve at the gas tank. The old valve had been defeated so I assume the prior owner was chasing this same problem. (A little cold blooded, he said). I have cleaned all connections at the solenoid and the main ground at the block. I will be ordering a new cap and wires.
I plan to purchase a new fuel pump. Not sure if this is my problem for the sputtering and backfiring but the current pump looks original and probably should be changed out at this time. It does not have a clean whirr sound when running. I hear a rattle like sound so I am assuming it is worn out not putting out enough to keep up with the demand when accelerating. Searching on-line and chatting with west marine (on-line) I cannot come up with a fuel pump match for a 1994 merc 4.3 lx. The closest I can find is a Sierra 18-7326 (8224065). Most places indicate this fits the 92, 93 and some say 96 as well but I can find no listing indicating the correct pump for a 1994. Any suggestions? I will be going out to the boat toning to see if I might be able to read a part number from the current pump.
Thank you,
JBB
Allow me to start with the fuel pump. My pump does not run when the key in in the on (not start) position. I hear conflicting advice on this. Should the fuel pump operate with the key in the on position without cranking or running the motor? There is no power to the pump at all when the engine is not running. The pump will run if I jump the connections at the solenoid (with the engine off).
Last year and again this year, I have sputtering and backfiring through the carb. I have replaced the plugs, battery, installed a rebuilt carb (old one was black as coal) and installed a new check valve at the gas tank. The old valve had been defeated so I assume the prior owner was chasing this same problem. (A little cold blooded, he said). I have cleaned all connections at the solenoid and the main ground at the block. I will be ordering a new cap and wires.
I plan to purchase a new fuel pump. Not sure if this is my problem for the sputtering and backfiring but the current pump looks original and probably should be changed out at this time. It does not have a clean whirr sound when running. I hear a rattle like sound so I am assuming it is worn out not putting out enough to keep up with the demand when accelerating. Searching on-line and chatting with west marine (on-line) I cannot come up with a fuel pump match for a 1994 merc 4.3 lx. The closest I can find is a Sierra 18-7326 (8224065). Most places indicate this fits the 92, 93 and some say 96 as well but I can find no listing indicating the correct pump for a 1994. Any suggestions? I will be going out to the boat toning to see if I might be able to read a part number from the current pump.
Thank you,
JBB
